I did measure it at 40 but I don't remember what it was. The gauge is still attached so I can let you know soon.

As far as 22" vacuum, it does go that high for a moment when I release WOT. The gauge goes from 0+- up to 22" and then settles in at 17 (it bounces).

I have not taken the modulator out.

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1981 300TD "The Green Lantern"
1980 300TD
1983 300D Euro "China Cat"